混凝土断裂表面带电异常研究
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摘要
实验研究了混凝土试件断裂破坏过程的电位信号。结果表明,混凝土在破裂过程中有电位异常产生,电位信号与试件受载的应变及其声发射率(破裂行为)具有良好的对应性。在混凝土破裂过程中,电位信号呈连续增大趋势,在主破坏时声发射率和电位信号均有大幅度增加。电位信号与试件破裂过程密切相关,可以为破裂提供前兆信息。混凝土破坏是裂纹的扩展、联合、贯通的结果,电位的主导产生机制是裂纹扩展尖端电荷分离及压电效应。
The electric potential signal was experimentally studied during fracture of concrete sample.The results show that there is electric potential abnormal generated in the fracture of concrete under load,and there is a good correlativity between electrical potential and strain & acoustic emission(AE) rate,that is,the fracture behaviors.The electric potential signal shows a continuously increasing trend in the fracture process of concrete,and there is large increasing in AE rate and electric potential in the main fracture.Electric potential signal is closely related to the fracture of concrete,which can provide precursory information for it.The fracture is synthetical results of extending,joining and transfixion of cracks in concrete,the dominant mechanism of electric potential is charge separation at crack tip in crack propagation and piezoelectric effect.
The electric potential signal was experimentally studied during fracture of concrete sample.The results show that there is electric potential abnormal generated in the fracture of concrete under load,and there is a good correlativity between electrical potential and strain & acoustic emission(AE) rate,that is,the fracture behaviors.The electric potential signal shows a continuously increasing trend in the fracture process of concrete,and there is large increasing in AE rate and electric potential in the main fracture.Electric potential signal is closely related to the fracture of concrete,which can provide precursory information for it.The fracture is synthetical results of extending,joining and transfixion of cracks in concrete,the dominant mechanism of electric potential is charge separation at crack tip in crack propagation and piezoelectric effect.
引文
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[2]梁磊,姜德生,孙东亚.光纤传感器在混凝土结构中的相容性研究[J].武汉工业大学学报,2000,22(2):11-14.Liang Lei,Jiang Desheng,Sun Dongya.Study on compatibility of fi-ber optical sensor in construct of concrete[J].Journal of Wuhan University of Technology,2000,22(2):11-14.
[3]王继军,赵国泽,詹艳,等.中国地震电磁现象的岩石实验研究[J].大地测量与地球动力学,2005,25(2):22-28.Wang Jijun,Zhao Guoze,Zhan Yan,et al.Rock experiments for re-search on seismic electromagnetic phenomena in China[J].Journal of Geodesy and Geodynamics,2005,25(2):22-28.
[4]王恩元,何学秋,刘贞堂,等.受载岩石电磁辐射特性及其应用研究[J].岩石力学与工程学报,2002,21(10):1473-1477.Wang Enyuan,He Xueqiu,Liu Zhentang,et al.Study on electromag-netic emission characteristics of loaded rock and its applications[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(10):1473-1477.
[5]王恩元,何学秋,李忠辉,等.煤岩电磁辐射技术及其应用[M].北京:科学出版社,2009.Wang Enyuan,He Xueqiu,Li Zhonghui,et al.Electromagnetic radia-tion technology of coal or rock and its application[M].Beijing:Sci-ence Press,2009.
[6]王恩元,何学秋,刘贞堂,等.煤岩动力灾害电磁辐射监测仪及其应用[J].煤炭学报,2003,28(4):366-369.Wang Enyuan,He Xueqiu,Liu Zhentang,et al.Electromagnetic radi-ation detector of coal or rock dynamic disasters and its application[J].Journal of China Coal Society,2003,28(4):366-369.
[7]王恩元,贾慧霖,李忠辉,等.用电磁辐射法监测预报矿山采空区顶板稳定性[J].煤炭学报,2006,31(1):16-19.Wang Enyuan,Jia Huilin,Li Zhonghui,et al.Monitoring and forecas-ting roof stability of goaf by electromagnetic emission[J].Journal of China Coal Society,2006,31(1):16-19.
[8]吴小平,施行觉,郭自强.花岗岩压缩带电的实验研究[J].地球物理学报,1990,33(2):208-211.Wu Xiaoping,Shi Xingjue,Guo Ziqiang.Study on the electrification of granite samples under compression[J].Chinese Journal of Geo-physics,1990,33(2):208-211.
[9]郝锦绮,刘力强,龙海丽,等.双轴压力下岩样自电位变化实验的新结果[J].地球物理学报,2004,47(3):475-482.Hao Jinqi,Liu Liqiang,Long Haili,et al.New result of the experi-ment on self-potential change of rocks under biaxial compression[J].Chinese Journal of Geophysics,2004,47(3):475-482.
[10]Takeuchi A,Bobby W S Lau,Friedemann TF.Current and surface potential induced by stress-activated positive holes in igneous rocks[J].Physics and Chemistry of the Earth,2006,31:240-247.
[11]Eccles D,Sammonds P R,Clint O C.Laboratory studies of electrical potential during rock failure[J].International Journal of Rock Me-chanics&Mining Sciences,2005,42:933-949.
[12]李忠辉.受载煤体变形破裂表面电位效应及其机理的研究[D].徐州:中国矿业大学,2007.Li Zhonghui.Study on surface potential effect and its mechanism of coal during deformation and fracture under load[D].Xuzhou:Chi-na University of Mining and Technology,2007.
[13]李忠辉,王恩元,刘贞堂,等.煤岩破坏表面电位特征规律研究[J].中国矿业大学学报,2009,38(2):187-192.Li Zhonghui,Wang Enyuan,Liu Zhentang,et al.Study on charac-teristics and rules of surface potential during coal fracture[J].Jour-nal of China University of Mining&Technology,2009,38(2):187-192.
[14]李艳娜,王恩元,赵恩来.单轴压力下煤样表面电位实验[J].煤炭学报,2009,34(6):806-809.Li Yanna,Wang Enyuan,Zhao Enlai.Experiment on surface poten-tial of coal under uniaxial compression[J].Journal of China Coal Society,2009,34(6):806-809.
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